refactor: use alpine base for lighter image

images/terraform-ci/Dockerfile

@@ -1,33 +1,46 @@
 # =============================================================================
 # Terraform CI Image
 #
-# Image légère pour les pipelines CI/CD Terraform
+# Image minimale Alpine pour les pipelines CI/CD Terraform
 # Inclut : Terraform, tflint, git
 # =============================================================================
 
-FROM hashicorp/terraform:1.5.7
+FROM alpine:3.20
 
 LABEL maintainer="Damien Arnodo"
-LABEL description="Terraform CI image with tflint for Gitea Actions"
+LABEL description="Lightweight Terraform CI image with tflint for Gitea Actions"
 
-# Installation des outils supplémentaires
+# Versions des outils
+ARG TERRAFORM_VERSION=1.5.7
+ARG TFLINT_VERSION=0.54.0
+
+# Installation des dépendances de base
 RUN apk add --no-cache \
     curl \
     git \
     bash \
-    jq
+    jq \
+    unzip \
+    ca-certificates
+
+# Installation de Terraform
+RUN curl -sL "https://releases.hashicorp.com/terraform/${TERRAFORM_VERSION}/terraform_${TERRAFORM_VERSION}_linux_amd64.zip" -o /tmp/terraform.zip \
+    && unzip /tmp/terraform.zip -d /usr/local/bin \
+    && rm /tmp/terraform.zip \
+    && chmod +x /usr/local/bin/terraform
 
 # Installation de tflint
-ARG TFLINT_VERSION=0.54.0
 RUN curl -sL "https://github.com/terraform-linters/tflint/releases/download/v${TFLINT_VERSION}/tflint_linux_amd64.zip" -o /tmp/tflint.zip \
     && unzip /tmp/tflint.zip -d /usr/local/bin \
     && rm /tmp/tflint.zip \
     && chmod +x /usr/local/bin/tflint
 
+# Nettoyage pour réduire la taille
+RUN rm -rf /var/cache/apk/* /tmp/*
+
 # Vérification des versions
 RUN terraform version && tflint --version
 
 WORKDIR /workspace
 
-ENTRYPOINT []
 CMD ["/bin/bash"]